In this episode, Zack mentions he needs to buy 300 rings for the seniors which is an indication to the size of the school.
Zack: What's wrong, Lisa?
Lisa: This ring put a green stain on my finger!
Zack: Why would it do that?
Lisa: Because it's not real gold, DUH!
Zack: Well, maybe it's just yours. (the rest of the gang reveals green marks after removing their rings) Maybe it's just ours.
(more students show up with green marks on their fingers)
Nerd: There he is!
Zack: Maybe it's just everybody's!
(they're thinking of ways to get class rings)
Screech: Maybe we can buy a bunch of cracker jacks and hope we get rings.
Lisa: I'd like to cover you in caramel and stick you in a cracker jack bag!
(Shows him her neck)
Screech: Oh no, did you get a hicky from a Martian?!
Zack: This is my associate, A.C. Slater.
Gem Diamond: What's the A.C. stand for?
Slater: Abnormally Cruel. (Gives a painfully firm handshake)
Gem Diamond: G.G.T.K. Good guy to know.
Gem Diamond would later appear in the California Dreams episode "Honest Sly".